<!DOCTYPE html>
<html>
<head>
<title>任意属性值</title>
<meta charset="utf-8">
<style>
*{
margin:0;
padding:0;
}
ul,li{
list-style: none;
}
#li1{
width: 200px;
height: 100px;
background: yellow;
margin-bottom: 10px;
border: 2px solid red;
}
#li2{
width: 200px;
height: 100px;
background: yellow;
margin-bottom: 10px;
border: 2px solid red;
}
</style>
<script>
window.onload=function(){
var Li1=document.getElementsById('li1');
var Li2=document.getElementsById('li2');
li1.onmouseover=function(){
startMove(this,'height',400);
}
li1.onmouseout=function(){
startMove(this,'height',100);
}
li2.onmouseover=function(){
startMove(this,'width',400);
}
li2.onmouseout=function(){
startMove(this,'width',200);
}
}
function startMove(obj,attr,target){
clearInterval(obj.timer);
obj.timer=setInterval(function(){
var icur=parseInt(getStyle(obj,attr));
var speed=(target-icur)/8;
speed=speed>0?Math.ceil(speed):Math.floor(speed);
if (icur==target) {
clearInterval(obj.timer);
} else{
obj.style[attr]=icur+speed+'px';
}
},30)
}
function getStyle(obj,attr) {
if (obj.currentStyle) {
return obj.currentStyle[attr];
} else{
return getComputedStyle(obj,false)[attr];
};
}
</script>
</head>
<body>
<ul>
<li id="li1"></li>
<li id="li2"></li>
</ul>
</body>
</html>
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